Chiba and Yoshii 1997 data and results

Above: Distribution of image separation for a magnitude-limited QSO sample of the HST Snapshot Lens Survey. Shown are model predictions for flat universes (thick lines). These are to be compared with the observed distribution (histogram) from the HST Snapshot Survey. A flat universe with 0.8 is apparently favored; a flat universe with = 1 underpredicts the number of lensed QSOs over the whole range of .

Above: Number of lensed QSOs with 4" as a function of for a universe with = 0 (thin line) and a flat universe (thick line). Typical uncertainty of prediction is indicated by an error bar. Dotted line shows the observed number of lensed QSOs from the HST Snapshot Lens Survey.